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1996 Fiscal Year Final Research Report Summary

Molecular biological studies on the mechanism of self protein splicing in the yeast VMA1 protozyme

Research Project

Project/Area Number 07458156
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Functional biochemistry
Research InstitutionThe University of Tokyo

Principal Investigator

ANRAKU Yasuhiro  The University of Tokyo, Department of Biological Sciences, Graduate School of Science, Professor, 大学院・理学系研究科, 教授 (20012643)

Co-Investigator(Kenkyū-buntansha) OHYA Yoshikazu  The University of Tokyo, Department of Biological Sciences, Graduate School of S, 大学院・理学系研究科, 助教授 (20183767)
Project Period (FY) 1995 – 1996
KeywordsVMA1 Protozyme / Vacuolar membrane ATPase / VDE DNA endonuclease / Protein splicing
Research Abstract

Protein splicing is a compelling chemical reaction in which two proteins are produced posttranslationally from a single precursor polypeptide by excision of the internal protein segment and ligation of the flanking regions. This unique autocatalytic reaction was first discovered in the yeast VMA1 protozyme where the 50 kDa site-specific endonuclease (VDE) is excised from the 120kDa precursor containing the N- and C-tereminal regions of the catalytic subumit of the vacuolar membrane ATPase. In this work we established a method for measuring in vitro protein splicing as follows : VDEs conjugated with various recombinant polypeptides at both N- and C-terminal ends were expressed in E.coli and examined for their ability to catalyze self splicing. Processed VDE was found in soluble pools, while unspliced precursors accumulated in insoluble pools, forming inclusion bodies. We demonstrated in vitro protein splicing by refolding of the denatured precursor molecules. The processing reaction eff … More iciently occurs with the purified precursor peptide. VDE bracketed by only 6 proximal and 4 distal amino acids is autocatalytically processed. Next, we randomized the conserved valine triplet residues three amino acids upstream of the C-terminal splicing junction in the VMA1 protozyme, and found that these site-specific random mutations interfere with normal protein splicing to different extents. Intragenic suppressor analysis has revealed that this particular hydrophobic triplet preceding the C-terminal aplicing junction genetically interacts with distal triplet residues preceding the N-terminal junction. This is the first evidence showing that the N-terminal portion of the vacuolar membrane ATPase subunit is involved in protein splicing. Our genetic evidence is consistent with a structural model that correctly aligns two parallel beta-strands ascribed to the triplets. This model delineates spatial interactions between the two conserved regions both residing upstream of the splicing junctions. Less

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 安楽泰宏: "プロトザイム-新しい自触的蛋白質修飾機構の発見" 医学のあゆみ. 174. 142-143 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kawasaki,M.,Hakino,M.,Matsuzawa,H.,Satow,Y.Ohya,Y.and Anraku,Y.: "Folding-dependent in vitro protein Splicing of the Saccharomyces carevisiae VMAI protozyme" Biochem.Biophya.Res.Commun.222. 827-832 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nogami,S.,Satow,Y.,Ohya,Y.and Anraku,Y.: "Probing novel elements for protein Splicing in the yeast Vmal protozyme : A study of replacement mutagonesis and intragenic suppression" Gcnetics. (印刷中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Anraku,Y.: "Structure and Function of the yeast vacuslor mcwhraue H^<+1>-ATPasc In “Transport Processes in Eukaryotic and Prokaryotic Olganisms"" Elsevier Scientific Publishers, Amsterdam, 17 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Anraku, Y.: "Ptotozyme -The discovery of a novel self protein aplicing (In Japanese)" Igaku no ayumi. 174. 142-143 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kawasaki, M., Makino, S., Matsuzawa, H., Satow, Y., Ohya, Y.and Anraku, Y.: "Folding-dependent in vitro protein splicing of the Saccharomyces cerevisiae VMA1 protozyme" Biochem.Biophys.Res.Commun.222. 827-832 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nogami, S., Satow, Y., Ohya, Y.and Anraku, Y.: "Probing novel elements for protein splicing in the yeast VMA1 protozyme : A study of replacement mutagenesis and intragenic suppression" Genetics. (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Anraku, Y.: Structure and function of the yeast vacuolar membrane H^+-ATPase, In "Transport Processes in Eukaryotic and Prokaryotic Organisms". Elsevier, Amsterdam, 93-109 (1996)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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